JP2010073227A - Objective lens driving device and optical pickup - Google Patents

Objective lens driving device and optical pickup Download PDF

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JP2010073227A
JP2010073227A JP2008235854A JP2008235854A JP2010073227A JP 2010073227 A JP2010073227 A JP 2010073227A JP 2008235854 A JP2008235854 A JP 2008235854A JP 2008235854 A JP2008235854 A JP 2008235854A JP 2010073227 A JP2010073227 A JP 2010073227A
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objective lens
driving device
focusing
optical
magnet
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JP4612085B2 (en
Inventor
Morikazu Kato
盛一 加藤
Katsuhiko Kimura
勝彦 木村
Takahiro Yamaguchi
高広 山口
Yoshiro Konishi
義郎 小西
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Hitachi Media Electronics Co Ltd
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Hitachi Media Electronics Co Ltd
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Priority to JP2008235854A priority Critical patent/JP4612085B2/en
Priority to US12/542,070 priority patent/US8199613B2/en
Priority to CN2009101667971A priority patent/CN101677003B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/035—DC motors; Unipolar motors
    • H02K41/0352—Unipolar motors
    • H02K41/0354—Lorentz force motors, e.g. voice coil motors
    • H02K41/0356—Lorentz force motors, e.g. voice coil motors moving along a straight path
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0933—Details of stationary parts
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/095—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0956—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin objective lens driving device which is adaptable to high density and fast recording and reproducing by reducing an unnecessary moment in a movable part including an objective lens, so as to suppress a tilt and vibration of the objective lens. <P>SOLUTION: The objective lens driving device includes: the objective lens 1 condensing light on the recording surface of an optical disk; a focusing coil 3 which is a driving means for operating the objective lens in a focusing direction being a direction of approaching or leaving to the optical disk and a tracking direction being the radial direction of the optical disk; tracking coils 4a to 4d; and a magnetic circuit. The magnetic circuit includes two magnets with the objective lens 1 therebetween. One of the magnets is shorter in length in the focusing direction and longer in length in the tracking direction than the other magnet. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、光ディスク装置において光ディスク記録面に対して記録再生光を集光する対物レンズを駆動するための対物レンズ駆動装置に関するものであり、さらに本対物レンズ駆動装置を備えた光ピックアップおよび光ディスク装置に関するものである。   The present invention relates to an objective lens driving device for driving an objective lens for condensing recording / reproducing light on an optical disk recording surface in an optical disk device, and an optical pickup and optical disk device including the objective lens driving device. It is about.

ディスク状の記録媒体上に情報を記録し、または記録された情報を読み出して再生する光ディスク装置は、ディスク上に比較的大きな量の情報を記録でき、また、媒体も剛性が大きく取り扱いが容易なため、コンピュータの外部記録装置や映像音声の記録装置として用いられている。   An optical disk apparatus that records information on a disk-shaped recording medium or reads and reproduces recorded information can record a relatively large amount of information on the disk, and the medium is also rigid and easy to handle. Therefore, it is used as an external recording device of a computer or a video / audio recording device.

このような光ディスク装置において、光ディスク上の記録面に光を集光する対物レンズをフォーカシング方向（光ディスク面に接近／離遠する方向）とトラッキング方向（ディスクの半径方向）に駆動する装置が対物レンズ駆動装置である。特許文献１等において、従来の光ディスク装置における対物レンズ駆動装置が開示されている。   In such an optical disc apparatus, an objective lens that drives an objective lens for condensing light onto a recording surface on the optical disc in a focusing direction (direction approaching / separating from the optical disc surface) and a tracking direction (radial direction of the disc) is an objective lens. It is a drive device. Patent Document 1 and the like disclose an objective lens driving device in a conventional optical disk device.

特許文献１の図１等に示すように、一般に対物レンズ駆動装置は、対物レンズを含む可動部と、この可動部を支持する支持部材と、ヨークおよび永久磁石からなる磁気回路で構成される。可動部にはフォーカシングコイルとトラッキングコイルが取り付けられており、フォーカシングコイルに駆動電流を印加することにより、永久磁石からの磁束との作用により生じる電磁力で可動部をフォーカシング方向に駆動し、同様にトラッキングコイルに駆動電流を印加することにより、永久磁石からの磁束との作用により生じる電磁力で可動部をトラッキング方向に駆動する。   As shown in FIG. 1 and the like of Patent Document 1, an objective lens driving device is generally composed of a movable part including an objective lens, a support member that supports the movable part, a magnetic circuit including a yoke and a permanent magnet. A focusing coil and a tracking coil are attached to the movable part. By applying a drive current to the focusing coil, the movable part is driven in the focusing direction by the electromagnetic force generated by the action of the magnetic flux from the permanent magnet. By applying a drive current to the tracking coil, the movable part is driven in the tracking direction by an electromagnetic force generated by the action of the magnetic flux from the permanent magnet.

特開平１１−３１６９６２号公報（第５頁，第１図）Japanese Patent Laid-Open No. 11-316962 (page 5, FIG. 1)

上記従来技術では、前記磁気回路は対物レンズを挟んで２つの磁石を有し、その２つの磁石のフォーカシング方向長さが等しいため、２つの磁石による前記フォーカシングコイルの生じる２つのフォーカス方向駆動力に差が生じ、対物レンズを含む可動部にモーメントが生じる。前記モーメントは対物レンズを傾かせ、光スポットの集光状態を劣化させる原因となる。このような光スポット品質の劣化は、記録再生時の信号劣化につながってしまう。   In the above prior art, the magnetic circuit has two magnets sandwiching the objective lens, and the two magnets have the same length in the focusing direction, so that the two magnets generate two focusing direction driving forces generated by the focusing coil. A difference occurs, and a moment is generated in the movable part including the objective lens. The moment causes the objective lens to tilt and causes the light spot to be condensed. Such degradation of the light spot quality leads to signal degradation during recording and reproduction.

特に、近年では光ディスクの高記録密度化が進み、記録再生光のレーザ波長が短くなり、対物レンズの開口が大きくなってきている。このため、光ディスクに対する対物レンズの不要な傾きが生じると、僅かであっても光スポットの集光状態への悪影響を与えるようになってきている。したがって、従来の対物レンズ駆動装置よりもさらに、光ディスクに対する対物レンズの不要な変位や傾きを小さく抑える必要が生じてきている。   In particular, in recent years, the recording density of optical disks has been increased, the laser wavelength of recording / reproducing light has been shortened, and the aperture of the objective lens has been increased. For this reason, if an unnecessary tilt of the objective lens with respect to the optical disk occurs, even if it is slight, it has a negative effect on the light spot condensing state. Therefore, it is necessary to suppress unnecessary displacement and inclination of the objective lens with respect to the optical disc to be smaller than those of the conventional objective lens driving device.

また、前記モーメントは対物レンズ駆動装置の振動特性においても、高周波帯域で対物レンズを含む可動部の振動の要因で、前記振動により位相や変位の乱れは制御の不安定要因となる。特に、近年では光ディスクの高速記録再生化が進み、制御帯域の高域化が望まれているため、前記振動は高速記録再生化の障害となり、高速記録再生化に対応できなくなる。   The moment is also a factor of vibration of the movable part including the objective lens in the high frequency band even in the vibration characteristics of the objective lens driving device, and the disturbance of phase and displacement due to the vibration becomes an unstable factor of control. In particular, in recent years, high-speed recording / reproduction of optical discs has progressed, and it is desired to increase the control band. Therefore, the vibration becomes an obstacle to high-speed recording / reproduction, and cannot cope with high-speed recording / reproduction.

本発明の目的は、このような実情に鑑みてなされたものであり、光ディスクに対する対物レンズの不要な傾きや振動を抑えることができる対物レンズ駆動装置を提供することにある。   An object of the present invention is to provide an objective lens driving device that can suppress unnecessary tilt and vibration of an objective lens with respect to an optical disk.

上記目的は、光ディスクの記録面に光を集光する対物レンズと、前記対物レンズを前記光ディスクに接近または離遠する方向であるフォーカシング方向および光ディスクの半径方向であるトラッキング方向に動作させるための駆動手段であるフォーカシングコイルとトラッキングコイルと磁気回路を有する対物レンズ駆動装置において、前記磁気回路は対物レンズを挟んで２つの磁石を有し、一方の磁石は他方の磁石と比較してフォーカシング方向の長さが短く且つトラッキング方向の長さが長いことにより達成される。   The objective is to drive an objective lens that collects light on the recording surface of the optical disc, and to operate the objective lens in a focusing direction that is a direction toward or away from the optical disc and a tracking direction that is a radial direction of the optical disc. In an objective lens driving device having a focusing coil, a tracking coil, and a magnetic circuit as means, the magnetic circuit has two magnets sandwiching the objective lens, and one magnet is longer in the focusing direction than the other magnet. This is achieved by having a short length and a long length in the tracking direction.

また上記目的は、前記磁気回路は対物レンズを挟んで２つの磁石を有し、磁石の体積は等しくなるように一方の磁石は他方の磁石と比較してフォーカシング方向の長さが短く且つトラッキング方向の長さが長いことにより達成される。   The above-mentioned object is that the magnetic circuit has two magnets with an objective lens in between, and one magnet is shorter in the focusing direction than the other magnet so that the magnets have the same volume and the tracking direction. This is achieved by having a long length.

また上記目的は、対物レンズを挟んで光ディスクと逆側に光学部品を有し、光ディスク面に平行な方向からの光が前記光学部品に入射し対物レンズと通過し光ディスクの記録面に光を集光させる対物レンズ駆動装置において、前記磁気回路は対物レンズを挟んで２つの磁石を有し、光の入射側の磁石は他方の磁石と比較してフォーカシング方向の長さが短く且つトラッキング方向の長さが長いことにより達成される。   In addition, the above object has an optical component on the opposite side of the optical disc across the objective lens, and light from a direction parallel to the optical disc surface enters the optical component, passes through the objective lens, and collects the light on the recording surface of the optical disc. In the objective lens driving device that emits light, the magnetic circuit has two magnets sandwiching the objective lens, and the light incident side magnet has a shorter length in the focusing direction and a longer length in the tracking direction than the other magnet. This is achieved by having a long time.

また上記目的は、２つの磁石による前記フォーカシングコイルの生じる２つのフォーカス方向駆動力の中心を結ぶ線が対物レンズを含む可動部の重心位置と一致することにより達成される。   Further, the above object is achieved by the line connecting the centers of the two focus direction driving forces generated by the focusing coils by the two magnets being coincident with the position of the center of gravity of the movable portion including the objective lens.

また上記目的は、光ディスクの情報を再生あるいは、光ディスクへ情報を記録する光ディスク装置に搭載される光ピックアップにおいて、請求項１から４のいずれか１項に記載された対物レンズ駆動装置を有することにより達成される。   Further, the object is to provide an objective lens driving device according to any one of claims 1 to 4 in an optical pickup mounted on an optical disc apparatus for reproducing information on an optical disc or recording information on an optical disc. Achieved.

本発明によれば、対物レンズを含む可動部に不要なモーメントが加わらない構造のため、光ディスクに対する対物レンズの不要な傾きは小さく抑えられたものとなっている。これにより、光スポットの品質が向上されるので、ますます高記録密度化される光ディスクにして安定した記録再生を行うことができる。   According to the present invention, since an unnecessary moment is not applied to the movable part including the objective lens, an unnecessary inclination of the objective lens with respect to the optical disk is suppressed to a small value. Thereby, the quality of the light spot is improved, so that stable recording and reproduction can be performed on an optical disk with higher recording density.

また、対物レンズを含む可動部に不要なモーメントが加わらない構造のため、可動部の不要な振動がない対物レンズ駆動装置を提供でき、この対物レンズ駆動装置を用いて情報の記録あるいは再生特性が良好で高速記録再生が可能な光ピックアップ、ひいては光ディスク装置を提供することができる。   In addition, since an unnecessary moment is not applied to the movable part including the objective lens, it is possible to provide an objective lens driving apparatus that does not cause unnecessary vibration of the movable part, and information recording or reproducing characteristics can be provided using the objective lens driving apparatus. It is possible to provide an optical pickup capable of good recording and reproduction at high speed, and thus an optical disc apparatus.

また、一方の磁石のフォーカシング方向長さを短くできるため、同磁石のフォーカシング方向光ディスク側と逆側の下面を光の光路として使用しても、前記理由より良好な記録再生が行える。そのため、光ピックアップならびに光ディスク装置の薄型化に適した対物レンズ駆動装置を供給することができる。   In addition, since the length of one magnet in the focusing direction can be shortened, even if the lower surface of the same magnet in the focusing direction on the side opposite to the optical disk side is used as the optical path of light, good recording and reproduction can be performed for the above reason. Therefore, it is possible to supply an objective lens driving device suitable for thinning the optical pickup and the optical disk device.

以下、添付図面を参照しながら、本発明の対物レンズ駆動装置を実施するための最良の形態を詳細に説明する。
図１〜図６は、本発明の実施の形態を例示する図であり、これらの図において、同一の符号を付した部分は同一物を表わし、基本的な構成及び動作は同様であるものとする。また、図１〜図６において、ｘ軸方向は図示しない光ディスクの接線方向であるタンジェンシャル方向、ｙ軸方向は光ディスクの半径方向であるトラッキング方向、ｚ軸方向は対物レンズの光軸方向であるフォーカシング方向である。 The best mode for carrying out the objective lens driving device of the present invention will be described below in detail with reference to the accompanying drawings.
1 to 6 are diagrams illustrating embodiments of the present invention. In these drawings, the same reference numerals denote the same components, and the basic configuration and operation are the same. To do. 1 to 6, the x-axis direction is a tangential direction that is a tangential direction of an optical disk (not shown), the y-axis direction is a tracking direction that is the radial direction of the optical disk, and the z-axis direction is the optical axis direction of the objective lens. Focusing direction.

本発明の対物レンズ駆動装置の第１実施形態について説明する。図１は、本実施形態における対物レンズ駆動装置の構成を概略的に示す斜視図である。図１において、対物レンズ駆動装置は、対物レンズ１、これを保持するレンズホルダ２，レンズホルダ２の支持手段、及びレンズホルダ２の周囲に配置される磁石から構成されている。レンズホルダ２の側面には、フォーカシングコイル３，トラッキングコイル４ａ，４ｂ，４ｃ，４ｄが所定位置に取り付けられている。   A first embodiment of the objective lens driving device of the present invention will be described. FIG. 1 is a perspective view schematically showing a configuration of an objective lens driving device in the present embodiment. In FIG. 1, the objective lens driving device includes an objective lens 1, a lens holder 2 that holds the objective lens 2, a support means for the lens holder 2, and a magnet disposed around the lens holder 2. On the side surface of the lens holder 2, a focusing coil 3 and tracking coils 4a, 4b, 4c and 4d are attached at predetermined positions.

レンズホルダ２の支持手段は、固定部６に一端を固定された弾性支持部材５ａ，５ｂ，５ｃ，５ｄにより支持されている。これらの弾性支持部材は導電性を有しており、フォーカシングコイル３，トラッキングコイル４ａ〜４ｄに対して電流供給を行う役割も兼ねている。   The support means of the lens holder 2 is supported by elastic support members 5 a, 5 b, 5 c, 5 d having one end fixed to the fixing portion 6. These elastic support members have conductivity, and also serve to supply current to the focusing coil 3 and the tracking coils 4a to 4d.

フォーカシングコイル３，トラッキングコイル４ａ〜４ｄは、弾性支持部材５ａ〜５ｄのレンズホルダ保持側の端部と半田等の導電性融着材により電気的に接続されている。固定部６には、シリコーンゲル等の粘弾性部材を充填したダンピングホルダが固定され、弾性支持部材５ａ〜５ｄに減衰を与える構造となっている。   The focusing coil 3 and the tracking coils 4a to 4d are electrically connected to the ends of the elastic support members 5a to 5d on the lens holder holding side by a conductive fusion material such as solder. A damping holder filled with a viscoelastic member such as silicone gel is fixed to the fixing portion 6 and has a structure that provides damping to the elastic support members 5a to 5d.

ここで、対物レンズ１とレンズホルダ２とフォーカシングコイル３とトラッキングコイル４ａ〜４ｄが可動部となる。   Here, the objective lens 1, the lens holder 2, the focusing coil 3, and the tracking coils 4a to 4d are movable parts.

レンズホルダ２の周囲には、コイル群に駆動力を与えるための磁石として、永久磁石１１ａ，１１ｂ及びヨーク１２が配置されている。永久磁石１１ａ，１１ｂは、磁化方向が図中ｘ軸方向で対向する磁石面が同相となるように配置されている。各々の磁石１１ａ，１１ｂは、磁性体から構成されたヨーク部材であるヨーク１２に取り付けられ固定，磁気回路を形成している。この磁気回路によって、フォーカシング方向とトラッキング方向に可動の対物レンズ駆動装置となっている。   Around the lens holder 2, permanent magnets 11a and 11b and a yoke 12 are arranged as magnets for applying a driving force to the coil group. The permanent magnets 11a and 11b are arranged such that the magnet surfaces facing each other in the x-axis direction in the figure are in phase. Each magnet 11a, 11b is fixed to a yoke 12, which is a yoke member made of a magnetic material, and forms a magnetic circuit. This magnetic circuit provides an objective lens driving device that is movable in the focusing direction and the tracking direction.

図２に本発明の磁石１１ａ，１１ｂの構造と配置を示す。本発明の薄型化に対応するため対物レンズを挟んで光ディスクと逆側に反射ミラーやプリズムなどの光学部品１３を有し、光ディスク面に平行な方向（図２ではｘ方向）からの光１４は前記光学部品１３に入射し、光学部品１３で光ディスク１５の記録面に垂直に入射する反射され、対物レンズ１と通過し光ディスク１５の記録面に光を集光させる。   FIG. 2 shows the structure and arrangement of the magnets 11a and 11b of the present invention. In order to cope with the thinning of the present invention, an optical component 13 such as a reflecting mirror or a prism is provided on the opposite side of the optical disk across the objective lens, and light 14 from a direction parallel to the optical disk surface (x direction in FIG. 2) The light is incident on the optical component 13, is reflected by the optical component 13 perpendicularly to the recording surface of the optical disk 15, passes through the objective lens 1, and collects light on the recording surface of the optical disk 15.

光１４の光学部品１３への入射方向の磁石１１ａは、他方の磁石１１ｂに対してフォーカシング方向の長さ（磁石高さＨ）が短く、トラッキング方向の長さ（磁石幅Ｗ）が長い構造となっている。光１４の光学部品１３への入射方向の磁石１１ａはフォーカシング方向の長さを短くすることができるため、前記磁石１１ａのフォーカシング方向に対して光ディスクとは逆側に光１４を通すことができ、対物レンズ駆動装置の薄型化が可能な構造となっている。   The magnet 11a in the direction of incidence of the light 14 on the optical component 13 has a structure in which the length in the focusing direction (magnet height H) is short and the length in the tracking direction (magnet width W) is longer than the other magnet 11b. It has become. Since the magnet 11a in the direction in which the light 14 is incident on the optical component 13 can shorten the length in the focusing direction, the light 14 can be passed to the opposite side of the optical disk with respect to the focusing direction of the magnet 11a. The objective lens driving device can be thinned.

図２と図３を用いて本発明の効果を説明する。
図３は薄型化に対応して光１４の入射側磁石２１ａのフォーカシング方向長さを短くした構造である。
図３の磁石構造において、フォーカシングコイル３に電流を印加すると入射側磁石２１ａのフォーカシングコイル３に加わるフォーカシング方向駆動力３２ａは、他方の磁石２１ｂと比較して磁石の大きさが小さくなるため他方の磁石２１ｂのフォーカシングコイル３に加わるフォーカシング駆動力３２ｂより小さくなる。この、フォーカシングコイル３に生じる２つのフォーカス方向駆動力３２ａ，３２ｂの差によって、対物レンズ１を含む可動部にモーメント３０が生じる。前記モーメント３０は対物レンズ１を傾かせ、光スポットの集光状態を劣化させる原因となる。 The effect of the present invention will be described with reference to FIGS.
FIG. 3 shows a structure in which the length in the focusing direction of the incident side magnet 21a of the light 14 is shortened in response to the reduction in thickness.
In the magnet structure of FIG. 3, when a current is applied to the focusing coil 3, the focusing direction driving force 32a applied to the focusing coil 3 of the incident side magnet 21a is smaller than that of the other magnet 21b. It becomes smaller than the focusing driving force 32b applied to the focusing coil 3 of the magnet 21b. Due to the difference between the two focus direction driving forces 32 a and 32 b generated in the focusing coil 3, a moment 30 is generated in the movable part including the objective lens 1. The moment 30 causes the objective lens 1 to tilt and causes the light spot to be condensed.

このような光スポット品質の劣化は、記録再生時の信号劣化につながってしまう。また、前記モーメント力３０は対物レンズ駆動装置の振動特性においても、高周波帯域で対物レンズを含む可動部の振動の要因で、位相や変位の乱れは制御の不安定要因となる。そのため、制御帯域の高域化ができず、高速記録再生化に対応できなくなる。   Such degradation of the light spot quality leads to signal degradation during recording and reproduction. The moment force 30 is also a factor of vibration of the movable part including the objective lens in the high frequency band even in the vibration characteristics of the objective lens driving device, and the disturbance of the phase and displacement becomes an unstable factor of control. As a result, the control band cannot be increased, and high-speed recording / reproduction cannot be achieved.

それに対して、本発明は図２のようにフォーカシングコイル３に電流を印加すると入射側磁石１１ａのフォーカシングコイル３に加わるフォーカシング方向駆動力３１ａは、他方の磁石１１ｂと比較して磁石の大きさが等しいため他方の磁石１１ｂのフォーカシングコイル３に加わるフォーカシング駆動力３１ｂと等しくなり。モーメント３０がゼロとなり、モーメントが生じない。   On the other hand, in the present invention, when a current is applied to the focusing coil 3 as shown in FIG. 2, the focusing direction driving force 31a applied to the focusing coil 3 of the incident side magnet 11a is smaller than the other magnet 11b. Since it is equal, it becomes equal to the focusing driving force 31b applied to the focusing coil 3 of the other magnet 11b. The moment 30 becomes zero and no moment is generated.

従って、本発明の対物レンズ駆動装置とすれば、対物レンズ１を含む可動部に不要なモーメントが加わらない構造のため、光ディスクに対する対物レンズ１の不要な傾きは小さく抑えられ、光スポットの品質が向上されるので、ますます高記録密度化される光ディスクにして安定した記録再生を行うことができる。また、対物レンズ１を含む可動部に不要なモーメントが加わらない構造のため、可動部の不要な振動がない対物レンズ駆動装置を提供でき、情報の記録あるいは再生特性が良好で高速記録再生が可能な光ピックアップ、ひいては光ディスク装置を提供することができる。また、光１４の入射側磁石１１ａのフォーカシング方向長さを短くできるため、同磁石のフォーカシング方向光ディスク側と逆側の下面を光１４の光路として使用しても、前記理由より良好な記録再生が行えるため、光ピックアップならびに光ディスク装置の薄型化に適した対物レンズ駆動装置を供給することができる。   Therefore, according to the objective lens driving device of the present invention, since an unnecessary moment is not applied to the movable part including the objective lens 1, an unnecessary inclination of the objective lens 1 with respect to the optical disc can be suppressed small, and the quality of the light spot is improved. Therefore, stable recording and reproduction can be performed on an optical disk with higher recording density. In addition, the structure that does not apply unnecessary moment to the movable part including the objective lens 1, it is possible to provide an objective lens driving device that does not cause unnecessary vibration of the movable part, and it has good information recording or reproduction characteristics and enables high-speed recording and reproduction. An optical pickup, and thus an optical disc apparatus can be provided. Further, since the length of the incident side magnet 11a of the light 14 in the focusing direction can be shortened, even if the lower surface of the magnet opposite to the focusing direction optical disc side is used as the optical path of the light 14, the recording / reproduction can be performed better for the above reason. Therefore, an objective lens driving device suitable for reducing the thickness of the optical pickup and the optical disk device can be supplied.

その際、２つの磁石の大きさを等しくなるように光１４の入射側磁石１１ａのフォーカシング方向長さを短く、トラッキング長さを長くしてもよい。   At this time, the focusing direction length of the incident side magnet 11a of the light 14 may be shortened and the tracking length may be lengthened so that the sizes of the two magnets are equal.

次に本発明の他の実施例について図４に示す。
図４のように２つの磁石の取り付け位置にフォーカシング方向位置に差が生じた場合、入射側磁石１１ａのフォーカシングコイル３に加わるフォーカシング方向駆動力４１ａは駆動中心４２ａに加わり、他方の磁石１１ｂのフォーカシングコイル３に加わるフォーカシング方向駆動力４１ｂは駆動中心４２ｂに加わり、２つの駆動中心４２ａ，４２ｂのフォーカシング方向位置に距離が生じる。 Next, another embodiment of the present invention is shown in FIG.
When there is a difference in the focusing direction position between the attachment positions of the two magnets as shown in FIG. 4, the focusing direction driving force 41a applied to the focusing coil 3 of the incident side magnet 11a is applied to the driving center 42a and the focusing of the other magnet 11b is performed. The focusing direction driving force 41b applied to the coil 3 is applied to the driving center 42b, and a distance is generated between the two driving centers 42a and 42b in the focusing direction position.

この駆動中心４２ａと駆動中心４２ｂを結ぶ線上に対物レンズ１を含む可動部の重心４３を配置できるようにフォーカシングコイル３ないしは磁石１１ａ，１１ｂを配置する磁気回路とすることによって、部品の取り付けばらつきなどのばらつきが生じても、重心からの可動部に加わる駆動中心までの距離が小さくできるので、不要なモーメントが小さくなり振動を抑制することができる。   By adopting a magnetic circuit in which the focusing coil 3 or the magnets 11a and 11b are arranged so that the center of gravity 43 of the movable part including the objective lens 1 can be arranged on the line connecting the drive center 42a and the drive center 42b, the mounting variation of components, etc. Even if this variation occurs, the distance from the center of gravity to the drive center applied to the movable part can be reduced, so that an unnecessary moment can be reduced and vibration can be suppressed.

また、前記重心４３の代わりに可動部の弾性支持部材５ａ〜５ｄによって求められる支持中心を駆動中心４２ａと駆動中心４２ｂを結ぶ線上４４に配置すると、部品の取り付けばらつきなどのばらつきが生じても、支持中心からの可動部に加わる駆動中心までの距離が小さくできるので、不要なモーメントが小さくなり対物レンズ１の傾きを抑制することができる。   Further, if the support center obtained by the elastic support members 5a to 5d of the movable portion instead of the center of gravity 43 is arranged on the line 44 connecting the drive center 42a and the drive center 42b, even if variations such as component mounting variations occur, Since the distance from the support center to the drive center applied to the movable part can be reduced, an unnecessary moment is reduced and the tilt of the objective lens 1 can be suppressed.

次に本発明の対物レンズ駆動装置１０１を光ピックアップ１１１に搭載した実施例について、図５を用いて説明する。なお、ここでは前記第一の実施例に示した対物レンズ駆動装置１０１を用いる例を示すが、他の実施例に示した対物レンズ駆動装置を用いた場合でも光ピックアップ１１１を同様に構成できる。   Next, an embodiment in which the objective lens driving device 101 of the present invention is mounted on the optical pickup 111 will be described with reference to FIG. Although an example using the objective lens driving device 101 shown in the first embodiment is shown here, the optical pickup 111 can be similarly configured even when the objective lens driving device shown in another embodiment is used.

図５に示すように対物レンズ駆動装置１０１は光ピックアップ１１１内に搭載される。発光素子１０２から射出された光は、対物レンズ１により光ディスク１の記録面に集光される。このように本発明の対物レンズ駆動装置を用いることで、データの高密度と高速記録再生に適した小型薄型化可能な光ピックアップ１１１となる。   As shown in FIG. 5, the objective lens driving device 101 is mounted in the optical pickup 111. The light emitted from the light emitting element 102 is condensed on the recording surface of the optical disc 1 by the objective lens 1. As described above, by using the objective lens driving device of the present invention, the optical pickup 111 can be reduced in size and thickness, which is suitable for high-density data and high-speed recording / reproduction.

次に本発明の対物レンズ駆動装置を搭載した光ピックアップ１１１を使用した光ディスク装置１１２の実施例について、図６を用いて説明する。なお、ここでは前記第一の実施例に示した光ピックアップ１１１を用いる例を示すが、他の実施例に示した光ピックアップ１１１を用いた場合でも光ディスク装置１１２を同様に構成できる。   Next, an embodiment of the optical disk device 112 using the optical pickup 111 equipped with the objective lens driving device of the present invention will be described with reference to FIG. Here, an example is shown in which the optical pickup 111 shown in the first embodiment is used, but the optical disk apparatus 112 can be similarly configured even when the optical pickup 111 shown in another embodiment is used.

光ディスク装置１１２は、光ディスク１１３を回転させるスピンドルモータ１１４と、光ピックアップ１１１と、光ピックアップ１１１を光ディスク１１３の半径方向に移動させる送り機構と、それらを制御するコントローラ１１５を備えている。コントローラ１１５にはスピンドルモータ１１４の回転制御回路１１６が接続しており、スピンドルモータ１１４に取り付けられた光ディスク１１３の回転制御が行われる。また、コントローラ１１５には光ピックアップ１の送り制御回路１１７が接続しており、光ピックアップ１１１を光ディスク１１３の半径方向に移動させる送り制御が行われる。   The optical disk device 112 includes a spindle motor 114 that rotates the optical disk 113, an optical pickup 111, a feed mechanism that moves the optical pickup 111 in the radial direction of the optical disk 113, and a controller 115 that controls them. A rotation control circuit 116 of the spindle motor 114 is connected to the controller 115, and rotation control of the optical disk 113 attached to the spindle motor 114 is performed. Further, a feed control circuit 117 of the optical pickup 1 is connected to the controller 115, and feed control for moving the optical pickup 111 in the radial direction of the optical disc 113 is performed.

光ピックアップ１１１で検出された各種信号１１８は、サーボ信号検出回路１１９と再生信号検出回路１２０に送られ、サーボ信号検出回路１１９によりフォーカスエラー信号やトラックエラー信号が生成され、コントローラ１１５からの指令と合わせてアクチュエータ駆動回路１２１からの信号により対物レンズの位置制御が行われる。また、再生信号検出回路により、光ディスク１１３上に記録された情報が再生される。   Various signals 118 detected by the optical pickup 111 are sent to a servo signal detection circuit 119 and a reproduction signal detection circuit 120, and a servo error detection circuit 119 generates a focus error signal and a track error signal. In addition, the position of the objective lens is controlled by a signal from the actuator drive circuit 121. Further, the information recorded on the optical disk 113 is reproduced by the reproduction signal detection circuit.

このように本発明の光ピックアップ１１１を搭載することによって、データの高速記録再生と高密度記録再生に適した高性能な光ディスク装置１１２を実現することができる。   By mounting the optical pickup 111 of the present invention as described above, a high-performance optical disk device 112 suitable for high-speed data recording / reproducing and high-density recording / reproducing can be realized.

本発明の対物レンズ駆動装置の実施例を示す図である。It is a figure which shows the Example of the objective lens drive device of this invention. 本発明のフォーカシング方向およびトラッキング方向から見た磁気回路の断面図である。It is sectional drawing of the magnetic circuit seen from the focusing direction and tracking direction of this invention. 従来のフォーカシング方向およびトラッキング方向から見た磁気回路の断面図である。It is sectional drawing of the magnetic circuit seen from the conventional focusing direction and the tracking direction. 本発明の他の実施例を示す図である。It is a figure which shows the other Example of this invention. 本発明の対物レンズ駆動装置を用いた光ピックアップを示す図である。It is a figure which shows the optical pick-up using the objective-lens drive device of this invention. 本発明の対物レンズ駆動装置を用いた光ディスク装置を示す図である。It is a figure which shows the optical disk apparatus using the objective-lens drive device of this invention.

符号の説明Explanation of symbols

１ 対物レンズ
２ レンズホルダ
３ フォーカシングコイル
４ａ〜４ｄ トラッキングコイル
５ａ〜５ｄ 弾性支持部材
１１ａ，１１ｂ 磁石
１４ 光
１５ 光ディスク
３０ モーメント
３１ａ，３１ｂ，３２ａ，３２ｂ，４１ａ，４１ｂ 駆動力
４２ａ，４２ｂ 駆動中心
４３ 重心
１０１ 対物レンズ駆動装置
１１１ 光ピックアップ
１１２ 光ディスク装置 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Lens holder 3 Focusing coil 4a-4d Tracking coil 5a-5d Elastic support member 11a, 11b Magnet 14 Light 15 Optical disk 30 Moment 31a, 31b, 32a, 32b, 41a, 41b Driving force 42a, 42b Driving center 43 Center of gravity 101 Objective lens driving device 111 Optical pickup 112 Optical disc device

Claims (6)

光ディスクの記録面に光を集光する対物レンズと、前記対物レンズを前記光ディスクに接近または離遠する方向であるフォーカシング方向および光ディスクの半径方向であるトラッキング方向に動作させるための駆動手段であるフォーカシングコイルとトラッキングコイルと磁気回路を有する対物レンズ駆動装置において、
前記磁気回路は対物レンズを挟んで２つの磁石を有し、一方の磁石は他方の磁石と比較してフォーカシング方向の長さが短く且つトラッキング方向の長さが長いことを特徴とする対物レンズ駆動装置。 An objective lens that collects light on the recording surface of the optical disc, and a focusing means that is a driving means for operating the objective lens in a focusing direction that is a direction toward or away from the optical disc and a tracking direction that is a radial direction of the optical disc In an objective lens driving device having a coil, a tracking coil, and a magnetic circuit,
The magnetic circuit has two magnets with an objective lens in between, and one of the magnets has a shorter length in the focusing direction and a longer length in the tracking direction than the other magnet. apparatus. 請求項１に記載の対物レンズ駆動装置において、
前記磁気回路は対物レンズを挟んで２つの磁石を有し、磁石の体積は等しくなるように一方の磁石は他方の磁石と比較してフォーカシング方向の長さが短く且つトラッキング方向の長さが長いことを特徴とする対物レンズ駆動装置。 The objective lens driving device according to claim 1,
The magnetic circuit has two magnets with an objective lens in between. One magnet has a shorter length in the focusing direction and a longer length in the tracking direction than the other magnet so that the magnets have the same volume. An objective lens driving device. 請求項１又は２記載の対物レンズ駆動装置において、
対物レンズを挟んで光ディスクと逆側に光学部品を有し、光ディスク面に平行な方向からの光が前記光学部品に入射し対物レンズと通過し光ディスクの記録面に光を集光させる対物レンズ駆動装置において、
前記磁気回路は対物レンズを挟んで２つの磁石を有し、光の入射側の磁石は他方の磁石と比較してフォーカシング方向の長さが短く且つトラッキング方向の長さが長いことを特徴とする対物レンズ駆動装置。 The objective lens driving device according to claim 1 or 2,
An objective lens drive that has an optical component on the opposite side of the optical disk with the objective lens in between, and light from a direction parallel to the optical disk surface is incident on the optical component, passes through the objective lens, and is condensed on the recording surface of the optical disk In the device
The magnetic circuit has two magnets with an objective lens in between, and the light incident side magnet has a shorter length in the focusing direction and a longer length in the tracking direction than the other magnet. Objective lens drive. 請求項１から３に記載の対物レンズ駆動装置において、２つの磁石による前記フォーカシングコイルの生じる２つのフォーカス方向駆動力の中心を結ぶ線が対物レンズを含む可動部の重心位置と一致することを特徴とする対物レンズ駆動装置。   4. The objective lens driving device according to claim 1, wherein a line connecting the centers of two focus direction driving forces generated by the focusing coil by two magnets coincides with a gravity center position of a movable portion including the objective lens. An objective lens driving device. 光ディスクの情報を再生あるいは、光ディスクへ情報を記録する光ディスク装置に搭載される光ピックアップにおいて、請求項１から４のいずれか１項に記載された対物レンズ駆動装置を有することを特徴とする光ピックアップ。   5. An optical pickup mounted on an optical disc apparatus for reproducing information on an optical disc or recording information on an optical disc, comprising the objective lens driving device according to claim 1. . 光ディスクの情報を再生あるいは、光ディスクへ情報を記録する光ディスク装置において、請求項５に記載された光ピックアップを有することを特徴とする光ディスク装置。   An optical disc apparatus for reproducing information from an optical disc or recording information on an optical disc, comprising the optical pickup according to claim 5.
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JP2015088202A (en) * 2013-10-30 2015-05-07 株式会社日立エルジーデータストレージ Optical pickup
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JP4612085B2 (en) 2011-01-12

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